Menampilkan Data di Database ke JTree Menggunakan Hibernate

Category.java

/*
 *  Copyright (c) 2011, StripBandunk and/or its affiliates. All rights reserved.
 * 
 *       http://stripbandunk.com/
 * 
 *  STRIPBANDUNK PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package stripbandunk.tutorial.jtreehibernate.entity;

import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;

/**
 *
 * @author Eko Kurniawan Khannedy
 */
@Entity
@Table(name = "stripbandunk_category")
public class Category implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue
    private Long id;

    private String name;

    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Override
    public boolean equals(Object obj) {
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        final Category other = (Category) obj;
        if (this.id != other.id && (this.id == null || !this.id.equals(other.id))) {
            return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int hash = 3;
        hash = 67 * hash + (this.id != null ? this.id.hashCode() : 0);
        return hash;
    }

    @Override
    public String toString() {
        return id + ". " + name;
    }
}

CategoryService.java

/*
 *  Copyright (c) 2011, StripBandunk and/or its affiliates. All rights reserved.
 * 
 *       http://stripbandunk.com/
 * 
 *  STRIPBANDUNK PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package stripbandunk.tutorial.jtreehibernate.service;

import java.util.List;
import stripbandunk.tutorial.jtreehibernate.entity.Category;

/**
 *
 * @author Eko Kurniawan Khannedy
 */
public interface CategoryService {

    List<Category> getAll();

    Category save(String name);
}

CategoryServiceImpl.java

/*
 *  Copyright (c) 2011, StripBandunk and/or its affiliates. All rights reserved.
 * 
 *       http://stripbandunk.com/
 * 
 *  STRIPBANDUNK PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package stripbandunk.tutorial.jtreehibernate.service;

import java.util.List;
import org.hibernate.Session;
import stripbandunk.tutorial.jtreehibernate.entity.Category;
import stripbandunk.tutorial.jtreehibernate.helper.HibernateHelper;

/**
 *
 * @author Eko Kurniawan Khannedy
 */
public class CategoryServiceImpl implements CategoryService {

    private Session session;

    public CategoryServiceImpl(Session session) {
        this.session = session;
    }

    public CategoryServiceImpl() {
        this.session = HibernateHelper.getSessionFactory().openSession();
    }

    @Override
    public Category save(String name) {
        session.beginTransaction();

        Category category = new Category();
        category.setName(name);
        session.save(category);

        session.getTransaction().commit();

        return category;
    }

    @SuppressWarnings("unchecked")
    @Override
    public List<Category> getAll() {
        return session.createCriteria(Category.class).list();
    }

    public void close() {
        this.session.close();
    }
}

CategoryTreeCreator.java

/*
 *  Copyright (c) 2011, StripBandunk and/or its affiliates. All rights reserved.
 * 
 *       http://stripbandunk.com/
 * 
 *  STRIPBANDUNK PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package stripbandunk.tutorial.jtreehibernate.helper;

import java.util.Collection;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeModel;
import stripbandunk.tutorial.jtreehibernate.entity.Category;

/**
 *
 * @author Eko Kurniawan Khannedy
 */
public class CategoryTreeCreator {

    private DefaultTreeModel model;

    private DefaultMutableTreeNode root;

    public CategoryTreeCreator(String rootName) {
        root = new DefaultMutableTreeNode(rootName);
        model = new DefaultTreeModel(root);
    }

    public void addAll(Collection<Category> collection) {
        for (Category category : collection) {
            add(category);
        }
    }

    public void add(Category category) {
        root.add(new DefaultMutableTreeNode(category));
    }

    public DefaultTreeModel getModel() {
        return model;
    }
}

Form.java

CategoryService service = new CategoryServiceImpl();

CategoryTreeCreator creator = new CategoryTreeCreator("Category");
creator.addAll(service.getAll());

jTreeCategory.setModel(creator.getModel());